Efficient Plant January 2018 - 42

feature | solution focus

MOTOR TESTING
Saves Steel Mill
Time, Money

Re-testing Gerdau's trolley motor with the
ALL-TEST PRO 5 (AT5) de-energized testing
instrument connected directly to the unit
found that the problem was in the festoon cabling from the motor-control junction cabinet.

42

| EFFICIENTPLANTMAG.COM

WITH AN ANNUAL manufacturing capacity of approximately 10M metric tons of
steel products, Gerdau (gerdau.com) is one
of the largest producers and recyclers of steel
in North America. Its Midlothian, TX, site
maintains an inventory of about 70 cranes in
a range of sizes for various uses throughout
the mill and materials-recycling operations.
The in-house predictive-maintenance
(PdM) team inspects the site's overhead
cranes quarterly. Alerted to a potential problem by the ALL-TEST PRO 5 de-energized
motor-testing instrument from All-Test Pro
(alltestpro.com, Old Saybrook, CT), technicians determined the root cause of the issue.

Initial analysis
during a quarterly
inspection
seemed to
suggest motor
degradation, but
was it?

BACKGROUND
The materials-recycling operation's #4
scrap-crane trolley motor was scheduled for
inspection during the first week of March,
2017. An AT5 de-energized motor-testing instrument was used to perform a motor-circuit
analysis (MCA), which enables a technician
to determine the condition of an electric
motor's windings. The hand-held AT5 had
been purchased in 2016 because it was more
portable than the steel mill's 60-lb. testing
instrument that required a dedicated 110-V
power source.
The AT5 was connected to the motor-control panel, and a motor-circuit analysis

JANUARY 2018



http://www.gerdau.com http://www.alltestpro.com http://www.EFFICIENTPLANTMAG.COM

Table of Contents for the Digital Edition of Efficient Plant January 2018

Efficient Plant January 2018 - 1
Efficient Plant January 2018 - Cover1
Efficient Plant January 2018 - GF1
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